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20~30Bar Variable frequency medium pressure oil-free water lubricated screw compressor
In industrial production such as medicine, electronics, chemical industry, microbial fermentation, blow molding, and pressure testing, as well as in power stations, ships, military, and national defense facilities, many medium-pressure oil-free water-lubricated compressors of 1.6 to 4.0 MPa are used.
At present, piston air compressors are mostly used in China and even internationally. However, piston air compressors have large vibrations, high noise, large leakage, and short lifespan. Therefore, they have low efficiency and large gas production. The same power is smaller, while the medium-pressure oil-free screw machine has a compact structure. Medium-pressure water-lubricated compressors have the characteristics of high working efficiency, low noise, small vibration, easy maintenance, low operating costs, and good air quality. At the same time, this series of machines adopts a microcomputer control system, and the whole machine is equipped with multiple protection functions such as pressure, temperature, and overload.
Oil-free medium pressure permanent magnet variable frequency water lubricated compressor:
Constant voltage control:
Can achieve high-precision constant pressure control with a pressure fluctuation range of 0.01MPa
Frequency conversion soft start:
Eliminate the peak current during starting, avoid grid impact, avoid current impact through step-by-step speed adjustment, and improve flexibility.
Avoid no-loading:
The compressor is prevented from being unloaded during operation and reduces ineffective energy consumption.
The permanent magnet motor uses high-efficiency rare earth magnets, which do not lose magnetism at 180°C and have a long service life.
It saves about 6%~7% energy than ordinary variable frequency motors.
It can exert the highest efficiency in a wider range, making the air compressor more energy-saving.
Technical Parameters
| Model | Pressure (bar) |
Air delivery (m3/min) |
Power (kW) |
Noise (DB) |
Cooling method | Compressed air outlet pipe diameter | Diemension | Air supply temperature |
Supply gas oil content |
| RKZW37 | 3.0~4 .0 | 3 | 37 | 68 | Water | G1" | 2000*1450*1435 | Cooling water temperature +14 ºC |
class 0 oil free |
| RKZW75 | 3.0~4 .0 | 6.0 | 75 | 72 | Water | G1" | 2000*1450*1435 | ||
| RKZW110 | 3.0~4 .0 | 10.0 | 110 | 75 | Water | DN40 | 2364*1580*1750 | ||
| RKZW160 | 3.0~4 .0 | 12.0 | 160 | 78 | Water | DN40 | 2364*1580*1750 | ||
| RKZW250 | 3.0~4 .0 | 20.0 | 250 | 78 | Water | DN50 | 2500*1900*1850 |
Shanghai Rocky Machinery Co., Ltd. was established in 2003 and has 18 years of experience in the air compressor industry. It is an innovative enterprise integrating production, trade, service, research and development.
We are professional gas compressors manufacturer since 2003, Germany standard, more than 100 workers, annual sales exceeding 20 million US dollars with 13 years of exporting experience, strict quality control and delivery on time. We not only supply gas compressor including screw air compressor, but also supply spares parts and after-treat machines.
Our main products series as follows.
Q1. Are you trading company or manufacture ?
A: We are professional manufacture of screw air compressor of Taicang,Jiangsu,China. More than 18 years of experience in air compressor manufacturing.
Q2. How long is the delivery time ?
A: For standard voltage ,15 working days. Non-standard ,please contact our sales.
Q3. What's payment term ?
A: T/T, L/C, D/P, Western Union, Paypal, Credit Card, and etc. Also we could accept USD, RMB, Euro and other currency.
Q4. How about your after-sales service ?
A: 1.Provide customers with installation and commissioning online instructions.
2. Well-trained engineers available to overseas service.
3.Worldwide agents and after service avaiable.arrange our engineers to help you training and installation.
Q5. How about your warranty?
A: One year for the whole machine and two years for screw air end, except consumable spare parts.
Q6. Do you have any certificate ?
A: Yes, per different customer's market need ,we can offer CE ,ISO etc certificate.
Q7. What about the maintenance ?
A: First maintenance need to be done after 500Hours, and then every 2000-3000 hours to do the normal maintenance, and consider the actual environment.
Q8. How do you control quality ?
A: 1. The raw materials are strictly inspected
2. Some key parts are imported from overseas
3. Each compressor must pass at least 5 hours of continuous testing before leaving the factory.
Q9. Do you offer OEM service ?
A: Yes.Both OEM & ODM service can be accepted.
Q10.How long could your air compressor be used?
A: Generally, more than 10 years.
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